Warning: GRRM is only partially working on TWoW. Handle your rage before continuing...
Hmm; finishing the story at the same time would put book 7 out in...HBO One final question on behalf of all your fans -- how's the next book coming?
George R.R. Martin I'm working on that, and a number of "Ice and Fire" related things at the same time. Not only "The Winds of Winter," which is Book 6, but we're also coming out with a big concordance called "The World of Ice and Fire," which is about the whole history of Westeros and will be lavishly illustrated. So I've been filling in some of the histories of the kings who ruled 200 years ago or 500 years ago. We've also been doing a map book, and I'm working on a new novella about Dunk and Egg, the prequel series I have. It's a slow process the way I write, especially books of this size that are as large and complex as they are. It's still a slow process. I am aware of the TV series moving along behind me like a giant locomotive, and I know I need to lay the track more quickly, perhaps, because the locomotive is soon going to be bearing down on me. The last thing I want is for the TV series to catch up with me. I've got a considerable headstart, but production is moving faster than I can write. I'm hoping that we'll finish the story at about the same time... we'll see.
Season 1 - Book 1 - 2011
Season 2 - Book 2 - 2012
Seasons 3 & 4 - Book 3 - 2013 - 2014
Season 5 - Book 4 - 2015
Season 6 - Book 5 - 2016
Season 7 - More of Books 4 & 5 (my guess) - 2017
Season 8 - Book 6 - 2018
Season 9 - Book 7 - 2019
Who knows... But I can't see the HBO series going much further than that, so I think 2020 is really the drop-dead timeframe. Hopefully GRRM doesn't drop dead before then...